//
//  UIImage+LLAdd.m
//  JunKeDai
//
//  Created by LG on 2017/12/25.
//  Copyright © 2017年 admin. All rights reserved.
//

#import "UIImage+LLAdd.h"

@implementation UIImage (LLAdd)

- (UIImage *)clipCircleImageWithCornerRadius:(CGFloat)cornerRadius
{
    UIGraphicsBeginImageContextWithOptions(self.size, NO, [UIScreen mainScreen].scale);
    
    // 根据 cornerRadius 截取
    CGRect rect = CGRectMake(0, 0, self.size.width, self.size.height);
    // 按路径裁剪
    [[UIBezierPath bezierPathWithRoundedRect:rect cornerRadius:cornerRadius] addClip];
    
    // 将原图片画到图形上下文
    [self drawInRect:rect];
    
    UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
    
    UIGraphicsEndImageContext();
    
    return image;
    
    
}

- (UIImage *)resizedImage
{
    return [self stretchableImageWithLeftCapWidth:self.size.width * 0.5 topCapHeight:self.size.height * 0.5];
}


+ (UIImage *)imageWithColor:(UIColor *)color
{
    CGRect rect = CGRectMake(0, 0, 1, 1);
    UIGraphicsBeginImageContext(rect.size);
    CGContextRef context = UIGraphicsGetCurrentContext();
    CGContextSetFillColorWithColor(context, [color CGColor]);
    CGContextFillRect(context, rect);
    UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
    CGContextAddEllipseInRect(context, rect);
    UIGraphicsEndImageContext();
    return image;
}

/// 根据一个颜色，返回一张图片，可对图片的某个角切圆角
+ (UIImage *)imageWithColor:(UIColor *)color rect:(CGRect)rect byRoundingCorners:(UIRectCorner)corners cornerRadii:(CGSize)cornerRadii
{
    // 1、生成图片
    rect = CGRectMake(0, 0, rect.size.width, rect.size.height);
    UIGraphicsBeginImageContext(rect.size);
    CGContextRef context = UIGraphicsGetCurrentContext();
    CGContextSetFillColorWithColor(context, [color CGColor]);
    CGContextFillRect(context, rect);
    UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
    CGContextAddEllipseInRect(context, rect);
    UIGraphicsEndImageContext();
    
    // 2、剪切
    UIGraphicsBeginImageContextWithOptions(image.size, NO, [UIScreen mainScreen].scale);
    [[UIBezierPath bezierPathWithRoundedRect:rect byRoundingCorners:corners cornerRadii:cornerRadii] addClip];
    // 将原图片画到图形上下文
    [image drawInRect:rect];
    UIImage *finalImage = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    
    return finalImage;
}

/// 根据一个颜色，返回一张图片，可设置图片的圆角
+ (UIImage *)imageWithColor:(UIColor *)color rect:(CGRect)rect cornerRadius:(CGFloat)cornerRadius
{
    // 1、生成图片
    rect = CGRectMake(0, 0, rect.size.width, rect.size.height);
    UIGraphicsBeginImageContext(rect.size);
    CGContextRef context = UIGraphicsGetCurrentContext();
    CGContextSetFillColorWithColor(context, [color CGColor]);
    CGContextFillRect(context, rect);
    UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
    CGContextAddEllipseInRect(context, rect);
    UIGraphicsEndImageContext();
    
    // 2、剪切
    UIGraphicsBeginImageContextWithOptions(image.size, NO, [UIScreen mainScreen].scale);
    [[UIBezierPath bezierPathWithRoundedRect:rect cornerRadius:cornerRadius] addClip];
    // 将原图片画到图形上下文
    [image drawInRect:rect];
    UIImage *finalImage = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    
    return finalImage;
}

// 裁剪
- (UIImage*)imageByScalingAndCroppingForSize:(CGSize)targetSize
{
    UIImage *sourceImage = self;
    UIImage *newImage = nil;
    CGSize imageSize = sourceImage.size;
    CGFloat width = imageSize.width;
    CGFloat height = imageSize.height;
    CGFloat targetWidth = targetSize.width;
    CGFloat targetHeight = targetSize.height;
    CGFloat scaleFactor = 0.0;
    CGFloat scaledWidth = targetWidth;
    CGFloat scaledHeight = targetHeight;
    CGPoint thumbnailPoint = CGPointMake(0.0,0.0);
    
    if (CGSizeEqualToSize(imageSize, targetSize) == NO)
    {
        CGFloat widthFactor = targetWidth / width;
        CGFloat heightFactor = targetHeight / height;
        
        if (widthFactor > heightFactor)
            scaleFactor = widthFactor; // scale to fit height
        else
            scaleFactor = heightFactor; // scale to fit width
        scaledWidth= width * scaleFactor;
        scaledHeight = height * scaleFactor;
        
        // center the image
        if (widthFactor > heightFactor)
        {
            thumbnailPoint.y = (targetHeight - scaledHeight) * 0.5;
        }
        else if (widthFactor < heightFactor)
        {
            thumbnailPoint.x = (targetWidth - scaledWidth) * 0.5;
        }
    }
    
    UIGraphicsBeginImageContext(targetSize); // this will crop
    
    CGRect thumbnailRect = CGRectZero;
    thumbnailRect.origin = thumbnailPoint;
    thumbnailRect.size.width= scaledWidth;
    thumbnailRect.size.height = scaledHeight;
    
    [sourceImage drawInRect:thumbnailRect];
    
    newImage = UIGraphicsGetImageFromCurrentImageContext();
    if(newImage == nil)
        NSLog(@"could not scale image");
    
    //pop the context to get back to the default
    UIGraphicsEndImageContext();
    return newImage;
}


- (UIImage *)zipImageWithSize:(CGSize)imageSize
{
    UIGraphicsBeginImageContextWithOptions(imageSize, NO, [UIScreen mainScreen].scale);
    [self drawInRect:CGRectMake(0, 0, imageSize.width, imageSize.height)];
    UIImage *resultImage = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    
    return resultImage;
}

@end
